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March 27, 2015

Posted by **lufuno nemugumoni** on Saturday, January 21, 2012 at 1:07pm.

1.What is the velocity of a small ball if the bigger ball immediately stops after collision?

2.What is the velocity of the bigger ball if it rolls in the same direction with the smaller ball at 0.5m/s?

- physics -
**drwls**, Saturday, January 21, 2012 at 1:22pmYou can answer both questions using conservation of momemtum. You do not have to assume an elastic collision. In fact, neither collision is elastic.

Let the masses of the two balls be M (500 g) and m (250 g). Let Vo be the initial velocity of M.

Let V be the final velocity of the big ball.

Let v be the final velocity of the small ball

1. M*Vo = m*v

v = (M/m)*Vo = 4 m/s

2. M*(2 m/s) = (0.5 m/s)*M + m*v

M*(1.5 m/s) = m*v

v = (M/m)*(1.5 m/s) = 3.0 m/s

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